Azo dye.



tams'rA-iras PATENT orator-i.

WILHELM enrtenorxr, or L'EvERKosEN, enmvmnxnssrenon T FARBENFABRIKEN VORM. 'FRIEDR. BAYER & '00., or ELeERrELn; GERMANYLA CORPORATIONOF I Specification of Letters Patent. Patented J 1 712 1g GERMANY;

-- .nzo DYE.

No Drawing.

I To (LEE whom it may concern! Be it known that I, NVILHELM German- Empire, residing at Leverkusen, Geri'nany, have invented new and useful Improvements in Azo Coloring-Matter, of which the following is a'specification.

-' .My invention relates to the manufacture and production of new bluish-black to black trisazo dyestuffs which are distinguished by their great solubility in water and" their excellent' afiinity for vegetable fibers. They are specially suitable for dyeing half-woolengoods and do n'otdye woolin-these :t'abrics. 15

The new dyes are obtained by combining thetetrazo compounds prepared from paraaminobenzene azo;2-amino-8-naphthol-6-sultonic acid or from para-aminobenzene-azo-2 amino-5-naphthol-7-sulfonic acid with one molecule of a meta diaminobenzeneor toluene sulfomc acid-and with one molecule of 2-amino-5-naphthol-7-sulfonic-acid or of a derivative of the'latter compound, or vice versa. I v

The new dyes are n, the shape of the 1r alkaline salts dark powders solublelin water generally with a bluish black color and soluble in concentrated sulfuric acid with blue color.

I11- order to illustrate the new process are tetrazotiZed by means of 14 parts of sodium nitritevand the necessary quantity of HCl. and the tetrazo compound thus prepared-is mixed with an aqueous solutioirof ZIpa-rts of the S'QdiUlD Salt of'meta-phenylenediannn inonosulfonic acid NH' ENH 380 1121 13 24 Sodiumcarbonateisiadd-ed to neutralize the free mineral acid. The lnter-medlate,coin:

I BnRoDoL'r," doctor of philosophy,chem st;.citlzen of the Application filed March 14,-1910. Serial No. 549,164.

pound which forms at once is'mixed with 31.5 parts of 2-phenylan1ino-5-naphthol 7 sulfonic acid dissolved in 700 parts of water containing 35 parts of sodium carbonate.v .The mixture is stirred for several hours, the

dyestujff is (if necessary salted out), filtered off and dried. It is in the shape of its sodium salt afterbeing dricdand pnlverized a dark powder soluble in water with) a bluish-black and soluble in concentrated suluric acid with a blue color. It dyes cotton deep blue-black and yields upon reduction with stannous chlorid and hydrochloric acid para-phenylenediamin, triaminobenzene-mono-sulfonic acid (1:2:415), 2.7-diamino-8 -naphtho1 6- su-lfonic acid and 2- pl gnylamino-6-amin0-5-11aphthoL'Z-sulfonic aci In the example the para-aminobenzeneazo-Q-amino-S-naphthol-(S-sulfonic acid can be replaced by the"para-aminobenzenerazo- Q-amino-5-naphtliol-T-sulfonic acid and the meta-phenylenediamin 'sulfonic acidby the meta-toluylenediamin sulfonic acid, the 2- phenylainino-5 -naphthol-7-sulfonic acid can be replaced by the Q-aminO-IS-naphthol-T- sulfoni'c acid itself or by other derivatives of this acid. ,Furt'hermore the tetrazo comamino-o-1raphthol-i'l-sulfonic acid and then poundcan vbe combined first with the '2- with the meta plienylenediamin sulfonic acid] 1. The herein described new t'risazo dyestufl 's which are. afterbe'ing dried and pulverized dark powders soluble inwater generallv with a bluish-black color and being soluble in concentrated sulfuric. acid generally with a blue color, dyeing cotton bluish-black to black sh'a'des but: not dyeing wool in half-wool, substantially as described.

2. The herein described new trisazo dyestuii obtainable from para-phenylenediamin,

2;amino 8snaphtholrti-sulfonicacid,2;phenylain'ino-5-naphthol-7-sulfonic acid and meta phenylen'ediamin' sulfonic acid, which -'is aftenbei'ng dried and pulverized a dark powder soluble in water with a bluish-black color, soluble in concentrated sulfuric acid with a'blue color,- dyci-n'g cotton blue-black shades but not dyeing wool in half wool and yielding up0n reduction with stannous In testimony whereof I have hereunto set chlorld and hydrochloric acid para-phenylmy hand in UIQDI'QSBDCC of two subscribing enediannn, trialnmofiuenzene sultomc acid witnesses.

(1:23:13), 2.? diamino-S41aphth01-6-su1- VVILHELM BERGDOLT. [1 s.] fonic acid and 2-pheny1amin0 6-amine-5 Witnesses: 1m ph'thol-T-sulfonic acid, substantially as dem'o K614 iu,

scribed. CHAS. J. VVRLGHT. 

